The best alternatives to Materia are Webiny, Makeroid, and Applivery. If these 3 options don't work for you, we've listed a few more alternatives below.
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Webiny is an open source enterprise CMS platform for users that are looking for great CMS experience, that is underpinned by unparalleled scalability, cost efficiency, infinite customization and data ownership through self-hosting.
Makeroid is a tool that helps Makers build apps without needing to be able to code. You just have to drag and drop components and join blocks to make the code. And then we do the magic transforming into an app! We have powerful tools, like three types of ads or in-app purchases to help you monetize your app or a floating-action-button